#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

struct ListNode
{
	struct ListNode* next;
	int k;
};
struct ListNode* FindK(struct ListNode* head, int k)
{
	if (head == NULL)
	{
		return NULL;
	}
	struct ListNode* fast, * slow;
	fast = slow = head;
	while (k--)
	{
		if (fast == NULL)
			return NULL; 
		fast = fast->next;
	}
	while (fast)
	{
		slow = slow->next;
		fast = fast->next;
	}
	return slow;

}
int main()
{
	return 0;
}